Great North War
Fought between 588 and 604 YP, the Great North War is what the generals in the Silver Army called the push to exterminate the unholy Shapeless Hordes from the continent of Sirania. Sadly, after sixteen years of fighting this had not been achieved, but the border with Allotheia in the north had been pushed back past the Darkfire River, making hundreds of leagues of farmland safe for humanity. This was considered good enough to end the war, and call it a victory.
The Arch of Victory was built in the city of Musard to celebrate the end of the war; perversely, shifting the border away from Musard marked the end of that city as a major military power, to be replaced by Feoffmet and the Dragon Legion.